Green's function approach to the magnetic properties of the kagome antiferromagnet

Details Green's function approach to the magnetic properties of the kagome antiferromagnet Green's function approach to the magnetic properties of the kagome antiferromagnet

2002-02-15

arxiv.org/abs/cond-mat/0202257v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 (two-column revtex4) pages, 5 ps figures. Submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.104424

The $S=1/2$ Heisenberg antiferromagnet is studied on the kagom\'e lattice by using a Green's function method based on an appropriate decoupling of the equations of motion. Thermodynamic properties as well as spin-spin correlation functions are obtained and characterize this system as a two-dimensional quantum spin liquid. Spin-spin correlation functions decay exponentially with distance down to low temperature and the calculated missing entropy at T=0 is found to be $0.46\ln{2}$. Within the present scheme, the specific heat exhibits a single peak structure and a $T^2$ dependence at low temperature.

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